Double-acting pneumatic motor



o. AfEnlcsQN. DUBLE ACTING PNEUMATIC MOTOR.

APPLlcmou man :un 31,1920. l A PatentedSept. 5, 1922'.A

2 Sanus-sneer l o. A. Emcs'oN. DOUBLE ACTING PNEUMATIC MOTOR.

APPLICATION FILED JULY 31.1920. `l 1,427,794. PatentdSept5,1922.

2 SHEETS- SHEET 2.

lllll I Patented Sept. 5, 1922. y i

UNITED STATES OSCAR A. :ai-tucson, or CHICAGO, ILLINOIS`,AssIGNOR 'ro W. W. KIMBALIIC `or CHICAGO, ILLINOIS,l A CORPORATION or ILLINOIS@r N y y 1,427,794 PATENT 1 oFI-I/C.,A

OMPANY,

:DOUBLE-ACTING rNnUI/IATIC MOTOR.

yApplication ined July 31,

To all whom t may concern y y Beit known that I, OSCAR A. Emoson, a citizen of the United y States, residing at` Chicago, in the-countyofv Cook and lState-oi f musical instruments, and has been designed more especially, although not exclusively, as va device to effect automatic actuation `of music sheet guides or tracker devices-as they are commonly known inthe art. y y

In Order` that my invention will be clearly 'understood both yas to its structure andas to its `peculiar utility asa motor for music sheet guides ory trackers I have illustrated the same in the accompanyingdrawings in connection with a tracker device, and refer-,p ring theretoy g Fig. 1 is afi-ont elevation of' the trackerrange or bar, music sheet and spools and the mountingdevices of `the latter, and showing my improved pneumatic motor applied thereto;l .y 4 f Fig. l2 is a top plan view, `partly broken out and in section, of the parts shown in Fig. V1; f

.Fig. 3

is. a vertical section through the pneumatic motor, takenon-the line 3 8 of` Fig. 1; and Y 4 v 'F'gz 4 is. a vertical sectlony taken on the lined-4: OfFlg.3.,i.Lijf" f. VReferring tothe: drawings, 5 designates as a whole a rectangular frame, in thevertical sides of whichare-journaled endwise movable chucks 6 and Zwhich support thel upw per or y.delivery roll 8, and similar/chueksf) and 10 which-support thelower forreceiving roll 11. 12 designatesthe perforated musici web `or sheet extending between the rolls `8` and 11 and travelingr overthe trackerrange or-,bar 13.` y'.lhechuck'v has ka spindle v6? the outer end `of which is lslidably mounted in a bracket 14 securedto one verticalside member of the frame 5,1said chuck and spindle being urged inwardly by a coil spring 15 abutting atits'outer` end against the bracket 14 and at its inner Aend against a collarlkeyed on the s indle 6. chuck7 hasaspindle 7 slid ly. mountedin a` bracket 17 secured to the. opposite` very tical member' Q-th .frame4 and carrylnga re-winding sprocket 18. s The chuck 9 of the lower roll has a spindle 9 slifdably mounted 1n a bracket 19 secured to the frame 5 and normally urged` inwardly by a coil spring bearing 22 on` the bracket "17;

i `Secured tothe frame 5 andthe bracket 14 is a laterallyfex-tending horizontal strip 23, and secured to the bracket "19 is and supported by. the'stripsv 23 and 24 is a double-acting pneumatic/motor, the details yof which are best shownin Figs.` 3 and v4.

y aflaterally y, extending `horizontal strip 24. `Secured to This motor comprises myv improved V- shaped-block 25, and a pair of movable bel-`v low wings 26 and 27 hinged ,at their `upper ends at 28 and v29- respectivelyto the upper y f end Yof the block 25 these .wings beingv equipped with theusual`-ioldable,sides 30 and 31, therebyv constitutinga pair of oppositely `acting bellowshaving .a common stationary side inthe `block 25. In thef i block 25 is a vertical duct 432, the lower end y' of which is tapped by apipe 33 to` which is connected ahose 3.4 leadingfto the usual exhaustior suction chest of the `instrumentconventionally indicatedA at 35l in Fig. 1.`

Communicating with the vertical duct 32 I is a `horizontal duct 36 that! extends through the rear side ,of the block 25,y as shown in Fig. 3, [and below thesame is a similar horizontal .duot-3 7 thatlikewise communicates the rear sideof ythe block-25.' y Communicating with and .extending at right anglesto the duct '36 is a duct 38 (Fig. i 4) that leads into the right hand pneumatic shownin Figs; 1 and 4,. and communicating with the vertical duct 32 and extends through with and extending .at'` right angles` to the duct 37 is asimilar duct 391 that leads into ythe left hand `pneumatic shownvinFigs. 1

and 4. Withintheducts 36 and`37 are lo-` catedsmallimetakdisks `40 and 41 respectively hav-ing therein bleed holes 42 and 43. The two pneumatics Aarefthusjin vconstant .communication with.. the exhaust or suction chamber .35y ythrough'. the .ducts and `bleed The i holes described. The pneumatics are held against simultaneous closing andforsimul- `taneous action by "bars 44 kthat fare pivot-A n j ally con Aect d to and kbetween the opposite 110 edges of their movable sides 26 and 27 as shown at 45 and 46 in Fig. 1. The bars 44 are preferably slotted., asshoivn at 47 and ride on guide pins 48 set into the front and rear sides of the block 25. rIhese bars 44 thus cause the movable sides of theA pneuniatics to act against each other, thereby holding both pneumatics normally open under the suction. Manifestly, if the suction effect in either pneumatic is destroyed, the two movable sides will move in unison in one direction or the other.

The tracker-bar 13 is equipped with the lusual row of apertures 13 which, in co-operation with the music sheet, control the striking` pneumatics of the player action in a manner well understood in the art. .lust opposite the ends of this row of openings 13 are a pair of openings 49 and 5() that, in the normal and correct position of the iusic sheet 12, lare covered by the edges of the latter. From the opening 49 at the left or bass end of the tracker-bar extends a tube 51 (Fig. 2) which leads to and communicates with a pipe 52 (Fig. 3) that is entered into the duct 37 through the rear wall of the block 25; and communicating with the opening' 50 at the richt or treble end of the trackerbar is a similar tube 53 that leads to and communicates with a pipe 54 that enters the duct 36 through the rear wall of the block' 25. Hence, if the opening 49 be 'uncovered by the music-sheet atmospheric air will enter through the tube 51, pipe 52, land ducts 37 and 39 into the left hand pneumatic shown in Figs. 1 and 4, whereupon the' movable sides of both pneumatics will swing to the left under the suction in the right hand pneumatic, as shown by dotted lines in Fig. 1. If the opening 50 at the right hand end of the tracker-bar be uncovered, atmospheric air will flow through the tube 53, pipe 54 and ducts 36 and 38 into the right hand pneumatic shown in Figs. 1 and 4, whereupon the movable sides of both pneumatics will swing to the right as shown by dotted lines in Fig. 1.

i The motor operates the upper or delivery .roll 8 to shift the latter endvvise by the following mechanism. y

Connecting` the movable sides 26 and 27 of the motor near their upper ends and on the back or reverse side is a bar 55 (Fig. 2) to the center of which is pivotally connected at 56'an actuating rod or bar 57 extendingr behind the frame 5 of the upper roll 8 and slidably mounted in a bearing block 58 on the rear side lof the frame 5, the rod eX- tending some distance'v beyond the frame 5. Fastencd on the free end of the rod 57 is a forwardly extending arm 59 carrying at its freel end a disk 60 that normally abuts against the outer end of the chuck spindle 7.

f Keyed on the rod 57` is a collar 61, and between this collar and the bearing block 58 is a coiled compression spring 62. .The springs 15 and 62 are both. under a light compression and act oppositely upon the roller 8, the spring` 15 tending` to shift said roller to the ri aeht, and the spring' 62 tending to shift said roller to the left. In the normal and correct position of the roller the two springs just balance or neutralize each other. y

ln the operation of the mechanism, so long as the music sheet remains in corieigft registration with the tracker-bar, both holes 49 and 50 are covered. and the motor is held idle or inactive in the position shown by .full lines in Fig. 1. lf the sheet creeps t0- ivard the right, the hole 49 is partly .un-v covered, the vacuum existing; in theleft hailed pneumatic is broken. and the movable sides of the tivo pneumatics swing in unison to 'the left, as indicated by dotted lines in Fig. 1. This, through the rod 57, arm 59` and disk 69, instantly shifts the roll 8 slifzlitly to the left so that the music sheet instantly resumes its normal and correct position on the tracker-bar. lf the music sheet creeps toward the left. the hole 50 is uncovered sufficiently to admit atmospheric air to the tube 52, which breaks the vacuum in the right hand pneumatic, causing' the movable sides of the pneumatic to swing toward the right. This` through the rod 57 and collar 61, compresses the spring' 62 and shifts the arm 59 and disk 6() away from the end of the chuck spindle 7 so that the spring 15 is then free to shift the roll 8 to the right until the hole 50 is fully covered, thus restoring the normal. and correct registration of the sheet with the tracker-bar- When the holes 49 and 59 are both covered by the sheet, the exhaust acting; through the tube maintains both of the motor pneumatics in normal condition wherein they are both under vacuum, and assume the balanced position shown by full lines in Fig. 1.

From the foregoing it will be seen that the motor acts to positively shift the roll 8 in one direction, overcoming the opposed and balanced action of the springs 15 and v62; while the spring 15 constitutes the active agent in shifting the roll 8 in the opposite direction when relieved by the motor of the opposition of the spring 62. This automatic shifting atcion is very sensitive and rapid, occurring upon the slightest partial uncovering of eithei` of the holes 49 and 50, and instantly restoring the music sheet to normal and correct registration before it has moved far enough to produce any discord in the music rendered by the instrument.

I claim:

1. A double acting pneumatic motor for music sheet tracker devices, comprising,y a stationary central block and a pair of bellows havin? movable sides hinged to opposite sides of said block, a main suction duct `said block and `communicating with said branch ducts on the opposite sides of said bleed vents from said main suction duct, a music sheet directly opening and closing said `pressure connections and a bar connecting and spacing the movable sides of said Abel lows for simultaneous movement in either direction.

2. A double acting pneumatic motor forv music sheet tracker devices, comprising a stationary V-shaped central block anda pair of bellows having movablesides hinged at their upper ends to opposite sides of the wide end of said block, la main vertical suction duct formed in said block, a suction pipe communicating with said main suction duct, horizontal branch ducts in said block leading from said main suction duct into said bellows, respectively, bleed vents in said branch ducts, independent pressure connections leadinginto said block and communr eating with said branch ducts on the oppos site sides of said bleed vents from said main dependent pressure suction duct, a` music sheet directly opening and closing said pressure connections and a bar connecting and spacing the movable sides of said bellows near their lower ends for simultaneous movement in either direction. t

3. A double acting pneumatic `motor for music sheet tracker divices, comprising a i stationary central block and a pair of belupper ends to opposite sidesvo the upper ends of said block, a main suction duct formed in said block, a suction pipe communicating with said main suction duct, branch ducts in said block leading from said mainfs'uction duct into said bellows, respectively, bleed vents` in said branch ducts, in connections leading through said block into both of said bellows, a music sheet directly opening and closing said pressure connections, abar connecting and spacing the movable sides of said bellows near their lower ends for simultaneous movementy in either direction, another bar connecting and spacing the movable sides of said bellows near their upper ends, andr anl actuating rod pivotally 'connected to said lastsnamed bar.

i s OSCAR A. ERICSON.

y lows having movable sides hinged at their 

